The source told Rapoport that the safety received a standard four-year deal with an option for a fifth year. Financial terms weren't disclosed.

Based on Smith being selected with the 29th pick in the 2012 NFL Draft, his four-year contract is expected to be worth just over $7.1 million with around $6 million in guarantees. The guaranteed amounts are expected to include the first three years of the contract.

In his 51-game career at Notre Dame, the 6-foot-2, 214-pound Harrison totaled 307 tackles, 18.5 tackles for a loss, 3.5 sacks, seven interceptions and 28 passes defensed. Harrison essentially was a four-year starter and was the lone team captain for the Fighting Irish during the 2011 season.

The Vikings traded their second-round pick (No. 35 overall) and a fourth-round choice (No. 98) to move back into the first round to select Smith, who's expected to be an instant starter and building block in a revamped secondary that also could start fifth-round pick Robert Blanton, Harrison's teammate at Notre Dame.

With Harrison under contract, left tackle Matt Kalil (first-round) and cornerback Josh Robinson (third round) are the lone unsigned picks from the Vikings' 10-member draft class.